What is is the speed of light?

Answer 1

The speed of light in a vacuum is 299,792,458ms-1 or 183,000 miles per second.

In scientific notation and rounding for ease of memorization, this is usually written as 3.00 x 108 m/s

It's value however is different for other media and can be calculated using the following formula:

v=c/n

That depends on what it's traveling through.

When it's traveling through nothing ... empty space, vacuum ... the speed

is 299,792,458 meters per second.

The speed is somewhat less in any material that light might travel through ...

air, water, glass, diamond, jello, etc. It's different in each material.

186,282.397 miles per second or 299,792,458 metres per second

The number to remember is: 300,000 kilometres per second

Answer 2

Answer #1:

The speed of light is 186,000 miles per second,

or 300,000 kilometers per second.

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Answer #2:

The speed of light, and of all other electromagnetic radiation, is

299,792,458.0 meters (186,282.397+ miles) per second in vacuum,

somewhat less in any material medium. (Every material is different.)

Answer 3

The speed at which light travels depends somewhat on what kind of material
it's traveling through. In vacuum ... the total absence of any material ... the
speed of light is 299,792,458 meters per second.

Answer 4

i believe the speed of light is 300,000 metres / second

Answer 5

186,000miles per second

or

300,000 metres / second

Answer 6

The speed at which (not wich) light travels in vacuum is approx 300,000,000 metres per second.

Answer 7

299,792,458 metres per second.

Answer 8

3.0 x 108 m/s